# Recent content by an_82

1. ### Hspice waveform problem

Dear FvM, I increased the time (lower frequency), but it does not change. It is interesting that the same Netlist is simulated correctly in 2003 !!
2. ### Hspice waveform problem

Hello all, I simulated a circuit in HSpice 2008. The problem is that the output waveform is not accurate and is segmented. Please see the attached picture. I used smaller step in .tran analysis, but it does not correct: .tran 1n 2u This problem does not exist in Hspice 2003.
3. ### Monte Carlo simulation for W/L+variaition oercent

I want to do Monte Carlo simulation with Gaussian distribution for W/L (width/length) in HSPICE in 0.35um CMOS technology. How much variation percent should I consider ? and why?
4. ### Total Gm of OTA versus Frequency

Dear erikl, I understood what you mean, but I could not get the desired output. I have two questions: 1. My circuit input is differential and the output is sigle-ended. How do I apply the input? I applied "ac=1 sin(0 1 1meg)" as the input voltage (in open-loop config.). 2. I putted a...
5. ### Total Gm of OTA versus Frequency

How can I plot the total Gm of OTA circuit versus Frequency in HSPICE?
6. ### slew rate of OTA circuit

I am simulating a trans-conductance circuit (OTA). I want to obtain pulse response of the circuit. So I applied a square waveform voltage as the input, then I see the output current. My question is that may I compare the output current waveform with input voltage and then calculate the slew...
7. ### output current of differential pair (Transconductor)

Hello every one I want to calculate output current of differential pair circuit which is used as a OTA, but I could not obtain. I attached the related paper which claims From eq. (2)-(4) we can obtain the output current of eq. (5), unfortunately I could not obtain the result which they...

Dear LvW, I can not use differential pair amplifier, because my desired output voltage should be single ended (one node). In fact I want to realize the circuit which do what you said: Vout=0.5*(v1-v2) but not double ended.

1. So I can eliminate M2 and M6, and directly have V1 + V2 = Vou. right? 2. Do you use M0,1,2,3 for having more accuracy? ( cascode structure)

To have better accuracy I will use your original circuit. two question: 1. What do M2 and M6 do? 2. Why do you put M0,1,2,3? I guess you utilized them to have cascode structure and more accuracy, right? Should we connect all of their gate to GND?

Dear xiahanzh, Thanks for your reply. Could you please explain how it works? Is it possible to make it simpler? (less no. of transistors)